Rock Meter
The rock meter is a gauge next to the fretboard showing you how well you're playing. There are three regions: green, yellow, and red. Green means you're doing well, Yellow means you're doing okay, and Red means you're doing poorly. If the rock meter falls to the bottom, you will get booted off stage and fail the song. However, if you're low in the red, the rock meter will flash, warning you that you're going to fail unless you pull yourself together or use star power (in most cases). Star power makes your rock meter rise more quickly, meaning you won't need to do as well to pass a certain section.
Rock Meter Data
Now one might ask, "How much does it take to fail a song?" or "How much do I need to hit to survive?". Well, here's some data on how much it takes to fail and the hit-miss ratios. The info is taken from the Unofficial Rock Meter guide at Scorehero. Credit goes to blackstang98 for finding the data for GH1-GH3. Guitar Hero World Tour Data was found by me.
For reference with results:
Empty strum =
Missed note
Guitar Hero 1
Starting from initial rock meter position (middle yellow):
Expert: 8 strums to red -> 15 strums to fail = 23 total strums
Hard: 8 strums to red -> 15 strums to fail = 23 total strums
Medium: 8 strums to red -> 16 strums to fail = 24 total strums (can only fail after song is 10% complete)
Easy: 6 strums to red -> 11 strums to fail = 17 total strums (can only fail after song is 20% complete)
Guitar Hero 2/80's
Starting from initial rock meter position (middle yellow):
Expert: 8 strums to red -> 14 strums to fail = 22 total strums
Hard: 9 strums to red -> 19 strums to fail = 28 total strums
Medium: 11 strums to red -> 23 strums to fail = 34 total strums
Easy: 6 strums to red -> 11 strums to fail = 17 total strums (can only fail after song is 20% complete)
Guitar Hero 3
Starting from initial rock meter position (middle yellow):
Expert: 7 strums to red -> 10 strums to fail = 17 total strums
Hard: 9 strums to red -> 14 strums to fail = 23 total strums
Medium: 13 strums to red -> 14 strums to fail = 27 total strums (can only fail after song is 10% complete)
Easy: 7 strums to red -> 8 strums to fail = 15 total strums (can only fail after song is 20% complete)
Full rock meter (high green):
Guitar Hero 1
Expert: 19 strums to yellow -> 13 strums to red -> 15 strums to fail = 47 total strums
Hard: 20 strums to yellow -> 14 strums to red -> 15 strums to fail = 49 total strums
Medium: 19 strums to yellow -> 13 strums to red -> 15 strums to fail = 47 total strums
Easy: 10 strums to yellow -> 10 strums to red -> 11 strums to fail = 21 total strums
Guitar Hero 2/80's
Expert: 11 strums to yellow -> 14 strums to red -> 14 strums to fail = 39 total strums
Hard: 15 strums to yellow -> 16 strums to red -> 19 strums to fail = 50 total strums
Medium: 19 strums to yellow -> 19 strums to red -> 23 strums to fail = 61 total strums
Easy: 8 strums to yellow -> 10 strums to red -> 11 strums to fail = 29 total strums
Guitar Hero 3
Expert: 17 strums to yellow -> 14 strums to red -> 10 strums to fail = 41 total strums
Hard: 21 strums to yellow -> 18 strums to red -> 14 strums to fail = 53 total strums
Medium: 30 strums to yellow -> 25 strums to red -> 14 strums to fail = 69 total strums
Easy: 15 strums to yellow -> 13 strums to red -> 8 strums to fail = 36 total strums
Guitar Hero World Tour
Expert: 19 strums to yellow -> 15 strums to red -> 12 strums to fail = 46 total strums
Hard: 21 strums to yellow -> 19 strums to red -> 16 strums to fail = 56 total strums
Medium: 31 strums to yellow -> 26 strums to red -> 18 strums to fail = 75 total strums
Easy: 15 strums to yellow -> 13 strums to red -> 9 strums to fail = 37 total strums
Beginner: 74 strums to yellow -> 65 strums to red -> 49 strums to fail = 188 total strums
Rock meter gains: (Note: this info is an average across the rock meter. It may be different in different regions)
Guitar Hero 1, 2/80's: Expert, Hard, Medium: 3 notes = 1 miss
Guitar Hero 1: Easy: 3 notes = 1 miss
Guitar Hero 2/80's: Easy: 2 notes = 1 miss
Guitar Hero 3: All Difficulties: 4 notes = 1 miss
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